Cylindrical grinding-machine



B. W. HANSON. CYLINDRICAL GRINDING MACHINE-Q APPLICATION FILED oer. 1. 1m.

Patented May 4, 1920.

12 SHEETSSHEET z.

Patsnted May 4, 1920;.

l2 SHEETS-SHEET 2.

QRNEY B. M. w.- HANSON CYLINDRICAL GRINDING MACHINE; AEELICATION FILED OCT- 7 I918.

Patented May 4,1920;

12 SHEETS -SHEET 3.

ulllrllll RN. vi

v a I I l l l I lvuu B. M. w. HANSON, CXMNDRICAL GRINDING MACHINE.

0 w m, 1n MI. 9 y 1 S l m H M m J nu 2 1 v 8 CHI. 6 h n? 1 :4 r

B. M. w. HANSON. fcvuwumcm GRINDING MACHINE,

T- V uE'D OCT. 7, 19 3- I 4, 1920 mame 12 SHEETSSHEET'6- B. M. W. HANSON. ICYLINDRICAL GRINDING MACHINE.

APPILICATIOII FILED 001.7. 1918.

I2 SHEETS-SHEET Z- Patented May.4,1920.I

B M, w. HANSON. CYLINDHICAL GRINDING MACHINE.

. "INVENTOfi "M m z 4 I k m 6 P a u 4 Y J 0 9.. Mm 6 I. I 8 7.. QM 6 6 m I 5 m L 1 w. m x a M 4 m. Pl J 1. m m: w ....m m 9 .H A w ll 1 v 1 w W. 4 1M n. r v v fl B: M. W. HANSON. CYLINDRIGAI GFHNDING MACHINE.

I v APPLICATION FILED GET-7,1913 I 1,339,027. t ted May 4,1926.

i2 SHEETSSHEET 9.

' zMtumc .B. M. W. HANSON. CYLINDRICAL GRINDING MACHINE.

. APPLICATION FILED OCT- 7, 1918. 1 339 027 Patented May 4, 1920.

- 12 SHEETSSHEET l0- Mug Emma'- "W W M B. M. W. HANSON.

CYLINDRICAI. GRINDING MACHINE.

Patented May 4,1920.

6) r M, APPLICATION FILED OCT- 7. I918. 1,369,052? I I2 SIIEETS SHEET II.

Q 04- W M M v man/4E? M. w. HANSON.

CYLINDRICAL GRINDING MACHINE.

APPLICATION FILED OCT. 7, I918.

1,339,027; Patented May4,192 6;

12 SHEETS-SHEET r2); 1" a.

i .121. my I I MIN-Mmmnvcvr M. w. Hanson. or HARTFORD, connncrxcri'r, assrenon. r pleura was COMPANY, or new YORK, N; Y., A coarommon" 0!. NEW JERSEY.

I cYLmnamaL qammne macnnvn.

- a ,1 1,39,027. v Specificationof Lettersl'atent, V Patented W, 1920. g v applioationnledfictolicr 7, 1918. Serlaf No. 257,282.

'l'o alt: whom it may concernfl 1 Fig. 2-is a plan View. I

Be it known that I, BENGT M. W. HANSON, 1 Fig. 3 is a fragmentary end view on an. a citizen of the Unlted States residing at enlarged scale taken from the left. Hartford, in .the county of I-fartford and I Fig. l is a fragmentary rear viewon'the 5 State of Connecticut, have invented certain same'scale as Fig. .3. 5' T 5 new and useful'Improvements in Cylindrlcal Fig. 5 is. a, fragmentary tra v 311.: Grinding-Machines, of which thefollowing tional 'view taken along the lines 5 -5 is a specification. U F1 4 and 10. A machine embodying the invention is- 1g. 6 is a fragmentary sectional view '10 particularly'well adapted for. the grinding 'taken along the line 6-6 of Fig. 5'. of shafts, lead screws and other machine -F1g. 7 is a fragmentary view showing'the parts which are cylindrical in shape. 'The headstockthe vlew being taken in the di machine is not limited to thegrinding of rection of the arrow 7appearing in Fig. 3. parts which are of the same diameter Fig; 8 is an end view of thetailstock taken throughout but may be used in cases where from the left. V E g 7 7o there are two or more sections withdifl'erent Fig. 9 is a plan view of the. tailstock.

diameters; The invention is particularly F 10 is a' fragmentary front view. applicable to a ,horizontal grinding machine g. 11 is a transverse sectional view-taken. and such. term is used in' the resent specialong the line 11 11 of Fig. 10. ficationto designate a machine of. the type- Fig. 12 is a transverse sectional view taken 76 illustratedhavmg a grinding wheel with a along the lines 12--12, of Figs. l10, 19 horizontal axis. r

I. ,and 21. Y One of the objects of the invention is to V Fig. 13-isa transverse sectional view taken providejfa grinding machine. which is along the line '13-136f Fig. 10. I I adaptedtoaccurately grind and size a shaft Flg. 14 is a transverse sectional view taken 80 or similarpa'rt at a single operation. In al ng the lines 14-4 of Figs. 10; 19',- 21 accordance with the invention the grinding muse. wheel, at a single relative passage along the jF1g. 1 5 is a fragmentary transverse secshaft, completes the grindlng'operation and tidnal view taken along th'e line 15-45 of reduces the. shaft to 'size. "Another object LL; 10. 5'

-' of the "invention is to .provide improved 1g. 16 is a transverse sectional view means for supporting the workto be ground. talwn along the lines 16-1-16 of Figs. 10"

and formoving it relatively to the wheel. andlS. A further object of the invention. is to ro- 17 is a fragmentary; horizontal view vide improved'means wherebyte fee ing artly in section alongt elin'e 17j- 7 o ,90 of the work can be effected eit er toward l 10,;showing in detail-a part of the lever the rig'ht or toward theleft as required. A- me hamsnn r i x furtheniibject of the-invention is to provide .Flg. 18 is a view of the gear casing taken improvedgmeans for stopping the movement from the front along the line 18-18 of of the work support at the completion of 4 F1 12. a a v grindin this -means .being' operable for. 1g. 19 1s a sectional view through the 1 either direction dfjeed. Furtheriobjectsjof gear casing taken along the line 19-19 of the invention will be apparentfrom the Fig. 12. F following specification and claims; 1g. 20 is a fragmentary sectional View 45, In the {accompanying drawings I have taken along the line 20-20 of Fig. 19. 10

shown the embodiment of the: invention; F 1g. 21 is'a sectional view through the which is now deemed referable, but it will ear casing taken along the line 21-21 of be understood that ,varlous modifications and. i i? 12.

substitutions of equivalents may be made ig. 22 is asectional view taken through wlthout departing from the spirit ofthe inthe gear casing along the line 22-22 of 10a vention as set forth in the claims appended Fi 12. 4 a I to this specification. v s has already been stated, the machine Of-the drawings: v is primarily intended for the grindingfof I Figure 1 is a front elevation of" a machine shafts, lead screws or other cylindrical emPodying the invention. bodies. For supporting 'the shaft or otherjno piece to begroundjsuch ;as shown at A, there is 1YOV1dQd-a hadS tO0k.,1 and a tailstock 2 avingf'ceiiters which engage the ends of the shaft. The grinding vwheel is shown at 7 and is positioned with its axis of rotation parallelto the axis-of the shaft. Means are provided whereby relatiye movement can be effected to bring the grinding wheel toward or away fromthe shaft. -.As

shown, =the'wheel is nxountedon a. slide 8 which is movable forward andhackwa'rd onv ways formedbn-the-"main framei Means are' 'also provided whereby relatiyej feeding movement can be" effected longitudinally of, the shaft" and preferably, as shownt the shaft is moved and the wheel is held bodily stationary. In the preferred construction theheadstook and. the tailstock are adjust- .ably secured to a table 8 which is adapted to be reciprocated longitudinally of the'n ag. chine along ways-*4 and, 5" formed;onv the, main frame 6. iT-he shaft A- i sji Q flted by means of the headstockand at-Tthe same time the table 3 is reciprocated-tdlcause the shaft to be moved past1thegrinding wheel. This eoinbi-ned rotative and longitudinal", movement of the shaft 'ca'ilse's: its entir'e sup? fate to be; presented rtoathe )grinding wheel. A single longitudinal movement of the shaft completes the grinding operation. Haiti'ii'g Briefly outlined the'basic featur and the, esseutiaPsteps ofoperation of the machine, I *willnowapro'ceed 'tozsa detailed. I g

or more bushings 3-1 any "one of whi ch may ddscription of the several: devices either-ehy the grinding wheel and the work are ope I atedtandl controlled to; eifect grindingfiijne I rapid, aceurate "and convenient-manner! he slide 8 which carries the grinding wheel is; shown cle'arlyin Figs. 2, 4, 5,: and r; 11. As showlifi the mainframeifiigis-tpro; vided with horizontal ways 9 and 10 which support the, slide-3 and; guide: it": for for-'1? wardfand backward movement. At its front I: end thesli'd'ei'sp'rovidedwith bearings 11 -and :12 in which is mounted a s indle=l3 marrying the'jgrinding wheel 7. eoured to. the spindle between the bearings 11 and: 1 2

is a belt lwheel 14, 1 The m'aiin drive shaft ofthe machine is shown at 15 (Fig'sl 2 and 4), bein mounted in bearings 16 and 17 carrie by the frame 6.? Power maybe supplied to main the main diiv'e shaft 15 -in 'anyl'usual or preferred'fnianner, but in the dr'awings, for

' the sake of il'hrstration, I have shown ban electric ,l notor :18 mounted with its; drive" shaft?igifalinenient'with thev shaft 15. Pref-1 ei'ably, there is'a flxibld coliplinglt) be-*3 tween the drive shaft of the motor andthe 'sha ft 15f, th1s'fcoupl'ing being positioned in a a housing2'Q support'ed on the mainframe.

-he main .lsliaft 1 5. carries/a belt wheel 21* which is positioned withitscentia'l" lane coincident with the central plane 0 the as aforesaid be1t"wheel 1d on the spindle 13.

r (Fig: 11 The pulleys 24 ed inqfixed positions on the inain fr me andthe pulley 23 is carried by the slide 8.' The changing the helttension.

, has beensht flferent 'diameterthe effective diameter of the ldrive wheel 21 can'be variedgfthus changinge l main; frame and-{extends longitiid longitudinal ways 38 and 39 w belt 22 passes around these two belt; wheels and als'ofaround idler pulleys 23, and 25 and 25 are mountpulley 23, can be moved" forward and-back ward on the slide to .tighten'or loos'en-Zthe .be1t 22 as required. Preferablyvthe pulley..

is supported on a spindle 26 carried by a yoke 27 formed at. the rear of a bar 28. This bar is slidably mounted'in an aperture 29 formed in the body of "the slideand is provided with rack teeth '30 which mesh {with the teeth of a pinion'31. This pinion is mounted on a short longitudinalshaft; 32

which {has a squaredend by'means ofwhich I it may be turned. Obviously, byv turning the shaftfln'd thepinion, the pulley 23 can bemoved rearwardior-forward to tighten. or loosen'the beltas maybe required. The 5 pulley is locked in adjusted "position by; o

means-0th screw 33 which serves to clamp the bar. 28." It will be clear that after adl justmeilt the pulley 23 i's 'movable forward and backward bodily'with 'the wheel 14 and V with thegrinding wheel .wheneverthe slide '8- is moved. :f'The positions of the idler pulleys 24faiidj '25jare such asto permit, such ,forward a d backward movement without 1 In orderth t the speedof thengrindihg" wheel niaybe "changed with respect to the speediof the drive shaft 15,1 provide one I t be: applied to the wheel 21 i to increase I the effective diamet er theieof: Such. a bushing,

i vn in place an'd'is illustrated in detail 6;" As shown};the bushin comprisesj' tiijvo half sections 34* and which are elainped into; engagement with L the wheel. by ineans' o'f sere'ws 35:35. I -PIfL m erably a pinBG serves to" positively prevent; relative ti'otativehioyeiifent between the v- 'sleeve andfthewhell" ItQwi'll'be clear that,"

by putting (in; o1"taking"hfi ithe'fsleve' or by substituting onesleeve for another of dif-w the relative speed of the grinding'wheel. The idler pulley 23 can be adjusted to corn- *pensate ,for changes in the length of the urfaces" the way '4 to protect the hearing, s 12a and prevent water or debrisfroin having access' 'thereto. The table is'fprovidedwitl1 i tailstock 2. The ways 38 and 39 are transtends throughout. the entire length and downward at both ends and forms a trough for collecting water and guiding it toward.

the rear. This trough ends in spouts 41 which discharge into a relatively large gutter/L2 extending longitudinally of the main frame. Coeperating with the flange is a guard 40 'w'hich-i's mounted on brackets extending upward from the main frame and which serves 'to' prevent the escape of water toward the front and which serves to guide the water downward into the is formed by the flange 40. t

The main body casting ofthe headstock 1 is formedto fit theways 38 and 39, as shown in Fi 3. The headstock: is adjustable longitu inally along the ways and can trough which be clamped in adjusted position by means of the bolts 43 having heads 44 adapted to engage the inner side of the way 38. Secured to the main frame of the headstock is a center 45 which is 'nonrotative (Fig. 7). Surrounding the center and rotatable about the axis thereof. is a ring 46 carrying a pin-'47.

This pin is adapted to engage a dog B'sea cured to the work for the purpose of driving it. Rigidlyfconnected with the ring, 46 is a spur gear 48 which meshes with apinion 49 on a. shaft 50 extending longitudinally of the headstock and'mounted in suitable bearings therein. At the other end the shaft 50 carries a bevel gear 51 which meshes with a bevel gear 52. This bevel gear 52 is secured to a shaft 53 which is carried by the headstock. and whieh extends diagonally downward toward the rear. At the lower rear end of the shaft is a belt pulley 54 andit'will be clear that when this belt pulley .is turned power is transmitted through the devices described. to rotate the ring 46 and thus through the pin 47 rotate the work; The means for rotating the wheel 54 will be described hereinafter.

The body part of the tailstock 2 is also formed to fit the ways 38 and 39. Bolts 55 similar to the bolts 43 are provided for clamping the tailstock in position after adjustment. Longitildinally slidable in the body of the tailstock is a sleeve 56 carrying a center 57 in alinement with the headstock center 45. Preferably the tailstock body is formed in two parts as shown. The upper part which carries the sleeve 56 is transversely adjustable on the lower part by means'of the screw 57*. This construct on permits the center 57 to be accurately alided with" the center 45. A spring 58 is provided for normally pressing the sleeve 56 with the center 57 toward the left, this spring abutting at its right-hand end against'aplug 59, Preferably a rod 60 extends through L 78 and 79 which extend .close the hub. As shown moreclearly in.

the plug 59 and has threaded engagement with the sleeve. By means of a knob 61 this rod may be turned and used to eject-the cen-v tefwhen' required. Thespring 58 normall serves to push the sleeve toward the left, and for moving the sleeve toward the right there is provided a pivoted hand lever 62. This hand lever is mounted at the upper end of a vertical .shaft 63 and at its lower end the shaft carries an arm 64 which at its end is 15 seated in an. aperture of the sleeve. It will be seen that by turning the lever 62 the bushing 56 may be drawn backward against the pressure. of the spring. The bushing 56 may be secured 'in adjusted means of the clamping lever 65.

When theshaftor other piece of work is to be mounted in the machine, the headstock and tailstock are relatively adjusted in acbordance withthe length of the shaft. Then v the shaft is provided with a dog B ada ted to engage the pin 47'; thedogged end 0 the shaft is engaged with the center 45 .the'center 57 is wlthdrawn by means of the lever 62 and is then permitted to move into engage- '90 ment with the other end of the shaft under the ,action of the spring 58. This insures a correct predetermined pressure at the centers. After the centers are thus engaged with the shaft the tailstock center is locked by means of the lever 65. 9 Power-for reciprocatin the table. for ro tat ing the work, for feet mg the wheel and for other purposes is transmitted through a gear mechanism which is contained in a housing 66 secured 'to the main frame, as shown in Figs. 3, 12-, 14 and 16.- At the right-hand end of the gear casing 66, as shown in Fig. 19, there pi'oje'cts a drive sleeve 67 carrying a belt wheel 68 A-belt 0 69 passes ovef the wheel 68 and ISO over a belt wheel 70 fin the main drive s aft 15.

The drive sleeve 67 is rotatably mounted in a-bearing in the gear casing and at its inner end carries two spur gears 71 and 72.

The gearv 7-2 meshes with a gear 73pm a horizontal shaft 74 rotatably mounted in bearings in the casing. Independently rotatably mounted on the shaft 74 are two differently diametered spur gears 75 and 76. Associatd respectively with the gears? 5 and 76' are clutches 75 and 7 6 by means of which either of the gears may be operatively connected with the shaft. ,Rigidly connected with the shaft is a hub 77 and connected respectively with the gearsare a-nnularfianges over and partlyin- Fig. 20, n expansible split ring 80 is located in the s .ace between the hub 77 and each 2 tween the ends of the ring. Mounted in a 39 position by 80 I frictional engagement with the flange 78,

thus clutching the-flange to ether with the, attached gear to th shaft.

radiaslFaperture the hub 77 is a plunger 83 adapted to engage the lever-81 to move such-a manner. as to expand the ring in he shaft 74 is provided with a longitudinal central aperture in 'which is slidably mounted a rod. 84,

this rod having longitudinal grooves 85 into "which project thebeveled ends of screws 86.

- The plungers 83 extend-respectively into the,

aforesaid grooves 85fand are beveled at their ends and adapted to be engaged respectively ,by the'ends of the screws. 86 when the rod is moved longitudinally. As shown, the rod 84 is in its central or neutral position, but it will be clearthat by moving the rod' in one direction orthe other either of the screws 86 may be engaged'with the corresponding plunger 83 to. expand the ciorresponding ring and clutch the: corresponding gear to the shaft' For moving the rod 84 l'ongitudi nally there is provided a non-rotatable sleeve 8? to which the rod 84 is So connected as to be longitudinally movable therewith.

T he sleeve 87 is preferably positioned within I asiipplemental casing or housing 87 which is secured to the main gear casing 66. The

- sleeve 87 has rack teeth at 88 which mesh with the teeth of a pinion 89 mounted on a transverse shaft 90, T he shaft 90 has bearings in the housingST? and also in the main frame 6, as shown in Fig. '16. The shaft 90 near its front end is proyided with an arm 90 to which is pivotally connected a vertical link 9.0". The upper end of the link 90 is connected with an arm 90 mounted -on a rock shaft 90 Connected to the rock shaft is a hand lever 90 (Figs. 10 and 16).- The hand lever-carries a spring-pressed I shaft 84.

ment with the drivesleeve 67.

, Alsorotatablymounted in the gear casing 66 is a horizontal shaft-'91 which is in aline Preferably, as shown, this shaft extends into the sleeve and has a bearing therein; Rigidly secured to the shaft 91 are two spur gears 92 and 93 speeds in accordance with which one of the shaft 7 4.

which areof different diameters. and which gears 75 and on the shaft 74." 'Itwill be gears and 76 is connected with the A'hbrizontal shaft 94 is rotatably mounted in hearings in the gear casing and is connected with the shaft 91 by means of a set of change-speed gears. illustrated, there are three differently diametered gears 95, 96

ing respectively with differentlydiametered gears. 98, 99 and loosely mounted on the shaft '94. The shaft 94 is provided with' a central aperture in whichis' slidably "and 97 mounted on theflshaft 91' a'ndmesha keyway in any of the gears 98, 99 or 100:

'Slidably mounted on the shaft 94 is a;

grooved collar 103 which is connected with l the rod 101 by means of a pin 104 extending through slots in" the shaft. A forked lever 105 has projections "engaging the groove of the-collar 103 and ismounted. 1 a. transverse horizontal rock i shaft 106; shown in Fig. 14. This rock shaft carries at its front end a gear segment 106which meshes with a pinionlOd" mounted on the rear end of a transverse horizontal shaft 106Wvl1ich is .carried by a bearing inth main frame. At the front end of "theshalft 106 is a hand lever .1O6 which is provided with a spring-pressed plunger adapted to co.-

operate with holes in the m'ain frame to i hold, the lever in any one of threeloperative positions. By properly moving the rock shaft by means of the hand lever 106 ,the key 102 may be moved to engage any one of the gears 98, 99 or 100. By means of this;

mechanism the shaft 94 may be driven from the" sha-f t 91 at any one of three 'relati'v e speeds.

A fourth'ihorizontal shaft 107 is rotatably mounted in bearings near the frontof the}:

casing 66, this shaftywith the parts. carried thereby being particularly clearly shown in Rotatably mounted on the shaft 107 Fig. 21. are two'spurgears 108'and 109 adapted respectivelyto mesh with the aforesaid said gear 71 on the drive sleeve 67 and with a gear 110 rigidly mounted on the shaft 94. F ormed respecti-vely on the gears 108, 109 are sets of clutch teethlll and 112 adapted respec-- tivelyto mesh with clutch teeth on a grooved clutch collar 113 which is plined on the shaft 107. For moving the clutch collar 113 there is provided a forked lever 114 mounted on a transverse. horizontal rock shaft 115 having a bearing in, the gear. casing, as

shown in Fig. 12. Extending downward i v k 1 from the forked lever 114 isa projection 116 arein mesh respectively with the aforesa1d.

having a spring-pressed pointed I plunger 117.- This-plunger is! adapted to cooperate from the bottom of the gear casing. The

pressure'ofthe plunger against the finger serves to hold the forked lever 1l4 together with the clutch [collar either in the lcentral' sides of the notch serve to insure the comwith a notched finger 118 projecting upward 1 do. I nectedto the shaft 107 to be driven in either direction with respect thereto plete disengagement of the clutch; when it is operated either manually, or automatically ilntheinanner to be described.- It' will be clear than when the clutch'col lar is in neutral position bothof the gears 1O8 and 109 will be disconnected from the shaft,- which will not be rotated. -By moving the clutch collar in c ne direction or'the other, either" of the goals may be operatively connected" with the shaft. By referring to: Figs. 12 and 14 it will be noted that the gearlOS,

1 WlllCh is driven directly from. the drive sleeve, is rotated in the counterclockwise dlre'ction, whereas the gear ,109, which is riven indirectly through the clutchesand I t echange-speed gearing, is rotated clockwise direction.- It I will 'thereforeflbc v I Iunderstood that by, shifting the clutch' eleinent 113, the shaft; 107 may be maintained Idle or may bejrotated in either. direction.

Mounted in one bearing in the main frame a transverse horizontal shaft 119 which is'at the same levelas the shaft 107,'as shown in s o Pied to mesh respectively with sets of clutch gg'll; This shaft119 carries at its inner nd a bevel gear 120 which meshes with evel pinions 121 and 122 relatively ro-tay mounted on the shaft 107. These'bevel fpinions are provided respectively with sets Qfelutch teeth 123 and 124 which are adapt-' teeth formed on a grooved collar 125." This cellar is splined to the'shaft'107. For mov- 3 ing the clutch collar 125 there. is provided an operating lever 126 which ,is secured to and projects upward-from a transverse horiz0ntal rock shaft...127 -mountedin bearings in the main frame. 'Secured to the rock shaft 127 at its front end is ahand lever 127? by means of which the shaft"can be turned.- The hand; lever carries a spring- "p ressed plunger adapted to cooperate withone of three operativepositions.

holes in the frame to' hold the lever in any I VVhen'the clutch collar 125- is in Its central neutral position. as shown, the shaft 119 is disconnected from the shaftlOT. However, by moving the clutch collar 125 in one directlon orthe. other by means of the hand lever 127 the shaft 119 may be operatively con- As shown most clearly in Fig. 22, a fifth. horizontal shaft 128 is mounted in bearings inthe gear casing (56. Loosely mounted on this. shaft are differently diametered spur gears 129 and 130 which mesh respectively with the aforesaid 1 rear 92 on the shaft 91 and with a gear 131 also mounted 011 the shaft 91. (onnectmlrespectively with the gears 129 and 130 are clutches-12 9" and 130 [which are similar in all respects to the, clutches 75* and 76 already described in .connection withthe gears 75 and 76. Repe tition of the description willbe unnecessary.

and in another bearing in the gear casing is'..

These clutches are controlled by means of a I 128; A non-rotatable sleeve 133is provided to which the rod 132 is connected for longitudinal movement. This sleeve 133 has rack teeth 134 which inesh with ,the teeth of a pinion 135. transverse horizontal rockshaft 136 mounted 'in bearings inthe housing '87. to the front'end of the shaft 136 is a hand rod 132 slidable in an aperture in-theshaft hlS pinion s secured to a j.

Secured i lever 136*, 'shownin Fig. 10. V This handle- ,ver is preyided with a spring-pressed plung l adapted to cooperate with holes in the 'main frame. whereby the lever maybe locked in any one of three operativepositio'ns. By meansof the hand lever 136- either'of the gears 129 or130may be connected'with the shaft 128 to drive it from the shaft at either'of two relative speeds, It will be seen thatthe two sets of clutches that I have described makeit-possible for the shaft 128' to be driven at anyone of foljlr speeds. The clutches 7 5*,and- 76 provide two speeds for'the shaft 91 and 'the clutches 12 9 and 130 provide -two speeds for the 'shaft 128 for each of the speeds of the shaft 91. a r v Preferably the, aforesaid gears 95, .96 and j 97 are not rigidly-secured to the shaft 91. but-are secured to asleeve 136' which is'rotat'able, on'the shaft. Also secured to the sleeve 136 is a spur gear 136 whiclnmeshes with a' pinion 136 on the shaft 128. This construction enables the gears 95,, 96 and 97 to be driven at any one of four speeds corresponding to the speeds of the shaft 128.

Secured to the left-hand end of the shaft l28 is'a bevel gear 13 7 which meshes with a bevel gear 138 on a shaft 139 (Fig. 16). This shaft 139 is mounted in a bearingin the housingB'T and is positioned with its axis inia transverse vertical plane, but the shaft is inclined, upward and forwardpref- Carriedby the headstock at each side of. and below the belt wheelj-l are two idler.

helt; pulleys 141 and 142 having theiraxes parallel-to the axes of the belt wheels 54 and 140. Carried by a bracket 143 at the Ilefbhand end o'f the main frame is an idler pulley1144 having its axis parallel to the axes of. the wheels and pulleys before re-' erred to. Preferably there is alsoa'n idler pulley 145. carried bythe-bracket 146 on the. housing-87-,-' the axis of this pulley also being para-llel Ht'o the axes of the other v shaft 170-ineither desired direction can be obtained by agiven movement of the lever .177 simply by, properly adjustingthe rod 179 to connect either the segment 171 or the segment 172.

As shown in Fig. 13, the lever 177 is provided with a lug 181 which is adapted to be engaged by dogs 182 and 183 carried by the aforesaid'movable bar 156. This bar is pro vided' with a" longitudinal Ir slot -.184cby means of which the dogs can be secured to the bar in any desired position. It will be recalled that the movement of the barv 156 is exactly proportionate" to that of 'the table. audit is therefore possible to so adjust the dog 182 that it will engage the lug on the lever .immediately afterthe work l has passed the wheel when movingtoward the left. The resultant movement of the lever serves to stop the table movement. The dog 183j'may'be so adjustedas to engage the'lug on the lever as soon as the work A haspassed the wheel when moving toward the right, thus again stopping the table.

From the description which has been given. it will be clear that the speed of the shaft 107 and of all of theparts driven thereby, including the table 3, is fixed when power is transmitted through the gear 108. However, when power is transmitted through the gear 109tbe'speed may be ad.- 1

justed by means of the gearing 95-100 and by means of the several clutches. The speed of the shaft when driven through this gearing is considerably less thariwhen driven directly from the drive sleeve 67..

Ordinarily it is desired to make use of the changespeed gearing. for driving the table slowly during grinding and to make use. of the rapid direct drive during the return movement of the table. In accordance with va rying conditions it is sometimes preferred to effect gruu'lmg' wlnle the table 18 moving from left to right and at other times to effect grinding while the table is moving from right to left. The adjustment to permit grinding in eitherdirection. as required. 18 effected by means of the lever 127twlnch serves to reverse the direction of rotation of the shaft 119 with respectto the direction of rotation of the shaft 107.

It will be obvious that. when the direction of rotation of the shaft 119 is relatively been. described. between the lever 177 and the clutch 113. By adjusting this motion reversing mechanism movement of the lever 177, for instance toward the left. can bemade to throw the clutch collar 113 either be required.

toward the left or toward the right as may Preferably I provide an interlocking mechanism which prevents the adjustment of the aforesaid motion reversing mechanism except when the lever 127- is in the proper position to make such adjustment necessary. As illustrated in Fig. 17 therod 1'79 carries agrooved collar 185 which is engaged by projections on a hand-lever 186. This handlever is movable about a vertical. pivot and is adapted to be used for'moving the rod 179 inward or outward as required. The lever 186-"is provided at the other side of the pivot with 'two spaced lock-' ing dogs '18? and 187. \Vhen the lever 186' is in its central neutral position, as shown. the dogs 187 and 187' clear the lever 127 and permit the lever to be freely moved. The dog 187- is so located that it prevents the inward movement of the lever 186 except when the lever 127 is in itsright-hand position; and the dog'187 is so located that it prevents the outward movement of the lever 186 except when the lever 127 is inits left-hand position. The dog 187 also serves as a lock to. hold the lever 127 in its right hand position so long as "the lever 186 remains in its inner. .llgsitioni..sand thediog" 187 serves as-a lock tohold the lever 127".

186 remains in its outer position.

. I The construction which I have described constitutes an interlocking mechanism which prevents/the movement of the rod 179 to reverse the connection bctweenthe lever 177 and the clutch 113 except when the posh tion of the clutch 125' is reversed. The mechanism also serves to prevent movement of the clutch 125 except when the connection is broken between the lever 177 and-the clutch 113. This automatic mechanism prevents the operator from carelessly adjusting the parts so that the dogs 182 and 183 will fail to reverse the table at the proper times. As has already been stated. thegrinding wheel 7 is mounted on a slide 8 which is movable forward and backward on suitable ways on the frame. For controlling the forward and backward movement of the wheel, either' to bring the wheel into operative relationship to the work or to feed the wheel during grinding. I provide a suitable feed mechanism. preferably hand operated. As illustrated (Figs. 5 and 11), the slide 8 carries a rack 188 which meshes with a spur.

pinion 189 carriedby a vertical shaft 190., Q

This shaft 190 is provided at its lower end witha'hevel gear 191 which meshes with a bevel pinion 192. The pnnon 192 is mounted at the rear end of a transverse horizontal At the forward end of the shaft 'lhese gears are mounted in a housing 196':

secured to the front oftli'ema in frame. The

1dler gear .199 carried by a shaft 200 mount-v 5 edin the housing." T ThlS idler gear 199 also meshes wan pinion 201 one-transverse shaft 202 carriedby; the housinglfseenred to the front,.end' of"theshaft- 202 is. a hand wheel. 203.: It will clear that by means of the ,handwheehpower Znay be transmitted through the gearing described to move the slide Sand the wheel 7 iforward'for back-' ward as required. Preferablyfin-order to v take up lost motion in the gearing, there is 15,..provided a counterweight 204-which is con- ,ne'cted with" the slide 8 by meansvof a chain ',205, the chain passing over'an-s-idler'pulley Preferably there'i's an arm fiiictionally 20 connected to the hub of the hand wheel 203. v

. This arm is provided with apointer 208 'adapted to codperate with/graduations 209 formed on the rim of the hand wheel. 11' i stop 210 is pivoted'at 211'to the main frame I and normally lies in the path of the arm 207. When the hand wheel with the arm is thrned'i'n the counter-clockwise direction.

' the stop" engages the arm and stops the hand wheel and the arm are turned in the clockwise direction. i a 'For cooperating with the grindirig I provide a suitable steady. rest ig. 11) 1 adapted to support the work and hold it in alinement. I do notlimit myself to any one form of steady rest but in the drawings I have shown a construction which is suit- 40. able? In the drawings the steady rest is des' ated-as a whole by 213,being mounted 'onan extension of the housing 196. The housing has uatransverse slide which carries the main frame 214 of the steady rest. 1 45. Forward and backward adjustment is sef'cured by means of a screw 215 and the A steady rest can be locked in adjusted position by 'meansof bolts 216, 216. Thereare three studs 217, 218 and 219for engaging U the: work; The. lower stud is vertically adjustable, and the upper stud is also vertically adjustable and is' adapted to .be swung upward about a pivot=at 220 to permit the work to be putin place and taken 550111;, 'A clamping screw'221 with a knob 222 serves to lock the upper studin engagei merit with the work.

I I provide means for supplying water to l the grindingwheel at alpoint adjacent the work, this means comprising a nozzle 223' which-1s connected with a. series. ofpipes Preferably these, pipes a re'mounted in part on a=casing or guard 225 which partly inrloses the wheel. A: valve is 1 -The aforesaid trough 42"(Eigs. 3 anti) end 0 the shaft, as for instancethe right- .hand end, is adjacent or oppositethe wheel. Then by means of the hand wheel 203 the move1nent thereof. However, the arm 207 30 is provided at 212 with a cam surface which is adapted tolift the stop 210 when the wheeljustedftoproperly engage. and support'the provided for starting and stoppin the fiowof water. I The water can be sup'p ied from an external source,.but preferably I provide a water pump as a permanent-part of the machine.

discharges 1nto a tank 227 in which. is positioned a' pump 228. The pump is of the centrifugal'type and has itsrotor 229 near the bottom ofi the tank. .The ump is .1. driven by means of a vertical s aft 230 lwhieh carries at its upper end a'belt pulley 231. A'belt' 232 "passes over F and around the belt pulley 231 :andalso over and around a belt pulley 233m the main drive-shaft 15. For guiding the belt 232 there are suit-- able idler pulle e234 and 235. 'The discharge side oft 'e'pump communicates directly .withthe pipe 224 which leads the" water from the p11 described. p Assuming that a cylindrical shaft such as A is to be ground, this is mounted onthe centers in the way alreadvdescribed. In

itially the table is so positioned that one.

p tothe wheel asbefore grinding wheel is advanced until it is in position to reducethe shaft to the required a diameter. During movement of the hand wheel the arm 207 is engaged withthe st p 210 and "after such engagement is .he-d

against further. rotative movement. The" the amount-of turning of the handwheel and therefore the amount of advance of the grinding wheel. The back. rest 213 is adshaft. a

The machine is now readyfor the commencement of the grindingv operation, it

being assumed that the several levers have been manipulated to properly adjust the clutches and the gearing. The lever 106 .110

! is so positioned as to give the required speed ratio between the travel of thetable and the rotation of the work, this ratio being determined by the diameter of the work,. the nature of the materiahthe amount of' stock to be removed, etc. The speed of travel of the table and the speed-.1612 rotation of the work may both be changed proportionately by means of th'e levers 90 and 136 which operate the clutches, as al; ready described. For grinding, the shaft 107 is to be driven through the change" speed gearing and therefore in the clocl't-. wise direction, as indicated in Fig. 14. Inasmuch as the table 3. is to be fed toward the right, the, shaft 119 must also be driven, 1 in the clockwise direction, To bring this about the clutch collar mustbe engaged 

